Buspirone Impurity 1, N-Nitroso Buspirone (CAS 872826-80-7) is an N-nitroso derivative identified as a genotoxic impurity risk in buspirone drug substance. Characterization requires high-resolution LC-MS and 1H/13C NMR to confirm molecular ion and nitroso-specific fragmentation, while UHPLC retention behavior and reference standard co-elution support quantification. Formation is typically via nitrosation of secondary amine precursors under nitrosating conditions during synthesis or storage. Regulatory control follows ICH guidelines for low level limits, requiring validated stability-indicating methods, forced degradation studies, and impurity profiling to ensure batch acceptability and robust mitigation strategies in raw material selection and process controls.
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